Improvement in saw-tooth swages



@wat attire.

JOHN LOUGH, OF BUUKINGHAM, CANADA.

' Letters Patent No. 111,953, dated February 21. 1871.

IMPROVEMEN'T IN SAWfTCOTH SWAGES.

'The Schedule referred to in these Letters Patent 'and making part ofthe same.A

To all whom it may concern Beit known that I, JOHN LOUGH, of the villageof Buckingham, in the county of Ottawa, in the Province of Quebec, inthe Dominion of Canada, inillwright, have invented new and usefulImprovements on 'Self-acting Saw-Tooth Press; and-I do hereby declarethat the following is a full, clear, and exact description of theconstruction and operation of the same, reference being had to theannexed drawing, where- Figure I represents a side elevation of thepress.

Figure II, a plan. Y

Figure III, a side elevation of the press arranged for circular saws.

Figure IV, a detail of the press.

Figure V, a detail of the press.-

Figure VI, a detail ofthe press.

Figure VII, a detail of the press.

This invention relates to an improved machinefor forming orvdressing theteeth of saws by pressure adapted to be driven by power, and, whenarranged for straight saws, it is self-acting or automatic.

It may here be well to remark that I have already obtained LettersPatent for the principleof forming cr dressing the teeth of saws bypressure, together with a hand-machine or apparatus, 85e., forperforming the same. 'lhese form no 'part of the present application inso far as the apparatus is concerned.

In the drawings similar letters o'f reference indicate like parts.

Letter a is the bed ot' the machine, being in form very similar to thebed of a lathe, and elevated to any suitable heightabove the ground Abysupports a,

of any, required construction f t2 'are two side pieces extendingupward, attached to or made in one with the bed a.

In these, journal-boxes are formed to carry the cross-shaft a, formedwith an eccentric, a4, situated between the two side pieces ai a2.

The bed a is formed with a projection, b, suitably provided to attachone end of the die-lever b to it. This lever is of the general formshown in the drawing, its'eud being attached to b, in the form of adouble eyc,`with pivot-pin 11".

A slide-block, b3, having a hole bored in it to iit thc eccentric a4, isplaced upon the. eccentric. rIhis is of snicient depth to reach down andact upon the upper side of the lever b, provided with a smooth tlatsurface.

i On the under side of this lever a spring, b, is situated for keepingthe lever up against the block D.

On the under side of the lever, and provided with a suitably-tbr1nedneck, by which it can be turned rund, yis attached the die c, and any ofits four sides presented for use.

Thelever may bc supplied with a variety of dies,

. tooth rests while b eing pressed.

Between the two side pieces a2, and attached one on each, are twoguides, c1 c, arranged to guide the saw 'sidewise to' the exact positionunder .the die.

The front .one may be adjusted by a set-screw, while the back one isoperated by a suitable har, c3,

vas will be hereinafter more particularly described.

On the back end of the shaft a3 a gear-wheel, c, is attached, actuatedby a suitable pinion, for transmitting the power to give motion to theparts of -the machine. i

On the arms of this wheel, and of the required length, a suitableprojectiomd, is 'situatefto act ou the end ofthe bar c3, causing it topress the guide c to that side and hold the saw in the proper positionlaterally, being so timed, as regards the revolution of the wheel, thatthe action of cl c1 shall commence to hold Ythe saw a little inadvance'of, and continue a little after the die c has pressed the toothof the saw, when it is' released.A j

On the upper sideof the bed a, as shown in the drawing, an adjustablerest, cl, is placed, adjusted, and held in any required position,'asregards distance from the anvil-c, by a screw, dgactuated by a wheel,d", the rest dl having a slot extending a considerable partthrough itina vertical longitudinal direction.

'lhe end d* of this slot is inclined at a suitableanglc to forni a restfor the backiof the wedge e, it being of `the notched .form .shown inFig. 1V, and made to conform to another inverted notched wedge, c2,attached, by a piu, e, to the slides c, sliding upon the top of thefront part of the rest dl.

To these slides e a saw-back rest, f, is attached by pivot j". On thisitY freely partially rotates.

The projection f2, in which this pivot is situated, corresponds to andbears in a suitably-formed concavity in e2, for the purpose ofpreventing the 'strain caused by the pressure ofthe saw against itinjuring the pivot f1.

lo hold the bottom end of the rest f in the proper position aprojection, fi, is formed at the bottom of e2, provided with an a'djusting-screw, g.

0n the upper side of the rest (ll, and in the` 1equired position, two'projections g1 are formed, carry ing the rock-shaft g.

0n this, between the projections, a double arm, g3,

. made to slide upo'n the bed a.-

is secured by a pin, g, thel pivot h passing through both ends .of thedouble arm, andi also through a slotted hole, 11.1, made in the topofthe wedge c.

Ou the yshafted, and on "the front end of it, is se cured the disk t,having on its inner side (shown in detail, Fig. Vl) a cam-formed groove,fil, receiving in it'the pin 'i2 attached to. the upper end of the'lever i?.

This lever is pivoted to the front-side piece .2 by pivot itl, on whichit is thus made to oscillate.

To the pin if?, at its lower extremity, a connecting;

rod, ltof the well-known double-jointed form,'lrnownas'safety,connecting-1ods, which will resist an ordinary pressure; butif a jam of any ofthe parts of the machine takes place it will yield anddouble up at the joints.

The other end of this connecting-rod is attached to the pin l at the endof the arm l1 secured on the front end ofthe rock-shaft g2, and causingit to partially-rotate. In doing this the arms g3 lift the wedge e,'itsback being retained close against the bottom .of the slot d byprojecting side pieces, on it, sliding in corresponding grooves intheside, attl1e end ofthe slot.,

In the wedge@1 another slotted hole, l?, of the'coniiguration andsituation shown in Figs'. 1V and VII, is formed, havinga pinflf, passingthrough it and the slides ci, causing the latter to move back,- as the,wedge el rises, by arms gl; consequently cia-nd f, being attached tothe slide e, move back also.

'Ihe sawis attached to j; and its teeth, automatically and linsuccession, placed upon the anvil c* in the following manner:

'lo the bottom end off spring-clasps m are attached, griping the'saw-sidewise with such force as to a little more. than support itsweight.

On the sides off grooves are formed for the side pieces m1 to slide in.These are formed with a head, m2, madeiu two pa1ts,'attached at theirtop, and having extensions n in front-griping the saw, when the stilllonger e: tensions nl behind are pressed apart,

This is accomplished by forming' theprojection u3- on el, with aninclined edge, n, acting as a wedge insertedin corresponding matr-icalinclines formed on the lower inner edge of h. Y

That the amount the saw may be lifted may he adjusted, a screw, a5, isprovided. Its bottom end maybe made by screwing it down to rest on f audI.eleva'te'the bead m2, so that, during the rise of el, it

moves through part of its stroke without the head lmz lbeing acted upon.

That the head fm2 may be brought hack, and not retain its position afterbeing elevated by n to the spindle-end u of the screw uf', a projection,o, is attached, coming andern, andas this descends o is' A pressed downwith it.

The machine is so arranged that-'the action o1 itsl parts,hcreiubeforedescribed, will be so arrangedl that the teeth of the saw olwill be placed on the anvil in -time to be acted upon by t l1e 'die c.

the desired-position by two suitable hangers phone oneach side 0f thesang-having their upper ends jp? A rest, 113,is secured, at any requiredposition, on the bed a by screw 11,,j also provided with a block, p5,actuated by a screw, p6, in the manner indicated in the drawing, to holdvvthe saw from backing out when the teeth are being treated.

In all other respects the machine is constructed the same as thathereinbefore described for straight saws.

'Having'. described the construction of my inven- First, as applied tostraight saws, and as arranged in Figs, I and II, the saw is introducedinto the machine and the first tooth to` be. treated placed upon theanvil ci.'

position, so that, when the wedge c1 is down in its place, the'saw olhas its back fairly against the front groove-d edge of f,`it beingadjusted by the screw g to 'the' required angle.

The saw is then held and supported bythe springclasps nz'.

' The guides c1 c are'next adjusted.v

The die nowdcscends and vpresses the tooth, after which the wedge c1 islifted in the manner above described, causing the projectionsl n toclasp andhold the 'saw' with such force'that' it overcomes the frictionofthe spring-clasps fm and draws the saw upward a sufficient amounttojbring the next tooth high enough, so that, when the wedge cdescends-again to itspla'ce, the next tooth is placed upon the anvilvand pressed, all theparts' of the machine operating as hercinbeforedescribed, and in this manner all the teeth are successively pressed.

Secondly, in the machine as arranged for circular saws, the operationfis asv follows:

The saw p being suspended -by its center by the adjustable .slidinghangers 'p, the position yof which may be varied bysl-iding themupoufthe bed a, and the height of the saw by the holes, as shown in thehangers iu- Fig. III, or vin any suitable manner, one

of its teeth isplaced upon the anvil c4.

The guides cl el are next adjusted,

'lhe rest p is then secured iu therequired position, with the block p5situated as shown in the draw.

c descends, pressing the tooth.

Byrevolving the screw '199 the block p5 is moved back a suiicientdistance to allow the saw and hangers p1 to slide back a sniicientamount for the saw to be turned round, and the next tooth laid upon theanlike manner the remainder of the teeth are treated.

"Having now described the construction and operation of my invention, towhichlhave given the name of LouGHs Improved Self-acting Saw-ToothPress, I beg to sta-te that I disclaim all other forms of saw'- toothpresses now iuuse.

vVVhat'I claim as my invention, and wish secured by Lett-ers I Patent,is the new and useful Improvements ou Self-acting Saw-Toothv Press]7 'asfollows:

1. Ilhecombinatiouof the griping and lifting de vices 'a al o Inf" u g?,with the holding devices m, as described. 2. The combinationof gripingand lifting devices with aholdiug device, and die,and anvil, asdescribed.

aml 1'ockshaft with devices for griping, holding, and lifting the rod,as described.

'MontreaL 1st day of November, A. l). 1870. JOHN LOUGH. Wituesseszj Tro.Rrromn, vROBERT MGKNEIGHTL.

tion,'I will now explain its operation.

The rest (lis then put and secured in its properiug,.to preventfthe sawbacking out when the die' vil and pressed in the same manner as thefirst. In

8. rEhe-combination of an irregularly-formed wedge

